參數(shù)資料
型號: DS80C400-FNY
廠商: Maxim Integrated Products
文件頁數(shù): 36/97頁
文件大小: 0K
描述: IC MCU 75MHZ 16MB HP 100-LQFP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
產(chǎn)品變化通告: Product Discontinuation 20/Feb/2012
標準包裝: 90
系列: 80C
核心處理器: 8051
芯體尺寸: 8-位
速度: 75MHz
連通性: 1 線,CAN,EBI/EMI,以太網(wǎng),SIO,UART/USART
外圍設(shè)備: 電源故障復(fù)位,WDT
輸入/輸出數(shù): 64
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: ROM
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 1.62 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-LQFP
包裝: 托盤
配用: DS80C400-KIT#-ND - EVAL KIT FOR DS80C400
DS80C400 Network Microcontroller
41 of 97
ADDRESSING MODES
Three different addressing modes are supported, as selected by the AM1, AM0 bits in the address control (ACON;
9Dh) SFR.
AM1:0
ADDRESS MODE
00b
16-bit (default when ROM disabled)
01b
24-bit paged
1xb
24-bit contiguous (default when ROM enabled)
16-Bit Address Mode
The 16-bit address mode accesses memory in a similar manner as a traditional 8051. It is op-code compatible with
the 8051 microprocessor and identical to the byte and cycle count of the Maxim high-speed microcontroller family.
A device operating in this mode can access up to 64kB of program and data memory. The DS80C400 defaults to
this mode following any reset.
24-Bit Paged Address Mode
The 24-bit paged address mode retains binary-code compatibility with the 8051 instruction set, but adds one
machine cycle to the ACALL, LCALL, RET, and RETI instructions with respect to the Maxim high-speed
microcontroller family timing. This is transparent to standard 8051 compilers. Interrupt latency is also increased by
one machine cycle. In this mode, interrupt vectors are fetched from 0000xxh.
24-Bit Contiguous Address Mode
The 24-bit contiguous addressing mode uses a full 24-bit program counter, and all modified branching instructions
automatically save and restore the entire program counter. The 24-bit branching instructions such as ACALL,
AJMP, LCALL, LJMP, MOV DPTR, RET, and RETI instructions require an assembler, compiler, and linker that
specifically supports these features. The INC DPTR is lengthened by one cycle but remains byte-count compatible
with the standard 8051 instruction set.
Visit www.maxim-ic.com/microcontrollers for a list of tools that support the DS80C400.
Extended Address Generation
FUNCTION
ADDRESS BITS 23–16
ADDRESS BITS 15–8
ADDRESS BITS 7–0
MOVX Instructions Using DPTRn
DPXn
DPHn
DPLn
MOVX Instructions Using @Ri
MXAX;EAh
P2;A0h
Ri
Addressing Program Memory In 24-Bit
Paged Mode
AP;9Ch
10-Bit Stack Pointer Mode
ESP;9Bh
SP;81h
External Program Memory Addressing
Since the DS80C400 is not bound to the 8051’s traditional 16-bit address mode, on-chip hardware enhancements
were made to accommodate the larger memory interfaces associated with 24-bit addressing. The DS80C400
provides SFR bits to configure certain port pins as upper address lines and chip enables. The Port 4 control
register (P4CNT; 92h) and Port 6 control register (P6CNT; B2h) control the number of chip enables that are used
and the maximum amount of program memory that can be accessed per chip enable. Tables 3 and 4 illustrate
which port pins are converted to address lines or chip enables as a result of the P4CNT and P6CNT bit settings.
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